Revert of Showing previews UI for Offline Previews

chrome/browser/android/offline_pages/offline_page_tab_helper.h

Index: chrome/browser/android/offline_pages/offline_page_tab_helper.h
diff --git a/chrome/browser/android/offline_pages/offline_page_tab_helper.h b/chrome/browser/android/offline_pages/offline_page_tab_helper.h
index 991857a8b84ba4ee6bfa6d031501026ca9d9671b..8ded15dff9f73a0f2da25095d9520ed0315bb29d 100644
--- a/chrome/browser/android/offline_pages/offline_page_tab_helper.h
+++ b/chrome/browser/android/offline_pages/offline_page_tab_helper.h
@@ -42,7 +42,7 @@
   }
 
   // Whether the page is an offline preview.
-  bool IsShowingOfflinePreview() const;
+  bool is_offline_preview() const { return offline_info_.is_offline_preview; }
 
   // Returns provisional offline page since actual navigation does not happen
   // during unit tests.
@@ -64,7 +64,7 @@
 
     // Whether the page is an offline preview. Offline page previews are shown
     // when a user's effective connection type is prohibitively slow.
-    bool is_showing_offline_preview;
+    bool is_offline_preview;
 
     void Clear();
   };